This 6-pack of black rectangular railing planter boxes comes with adjustable metal hooks and matching base trays. Built-in drainage holes prevent overwatering, while the adjustable hooks fit various railing widths, making them perfect for growing flowers, herbs, and succulents on fences, balconies, and patios. | Oumilen | | 6-Pack Railing Planter Boxes, Black Adjustable Hook Rectangular Window Planters with Drainage & Tray for Fence Balcony | Best Buy